# -*- coding: UTF-8 -*-
"""
# WANGZHE12
"""
import numpy as np


def update_parameters_with_gd_test_case():
    np.random.seed(1)
    learning_rate = 0.01
    W1 = np.random.randn(2, 3)
    b1 = np.random.randn(2, 1)
    W2 = np.random.randn(3, 3)
    b2 = np.random.randn(3, 1)

    dW1 = np.random.randn(2, 3)
    db1 = np.random.randn(2, 1)
    dW2 = np.random.randn(3, 3)
    db2 = np.random.randn(3, 1)

    parameters = {"W1": W1, "b1": b1, "W2": W2, "b2": b2}
    grads = {"dW1": dW1, "db1": db1, "dW2": dW2, "db2": db2}

    return parameters, grads, learning_rate


def random_mini_batches_test_case():
    np.random.seed(1)
    mini_batch_size = 64
    X = np.random.randn(12288, 148)
    Y = np.random.randn(1, 148) < 0.5
    return X, Y, mini_batch_size


def initialize_velocity_test_case():
    np.random.seed(1)
    W1 = np.random.randn(2, 3)
    b1 = np.random.randn(2, 1)
    W2 = np.random.randn(3, 3)
    b2 = np.random.randn(3, 1)
    parameters = {"W1": W1, "b1": b1, "W2": W2, "b2": b2}
    return parameters


def update_parameters_with_momentum_test_case():
    np.random.seed(1)
    W1 = np.random.randn(2, 3)
    b1 = np.random.randn(2, 1)
    W2 = np.random.randn(3, 3)
    b2 = np.random.randn(3, 1)

    dW1 = np.random.randn(2, 3)
    db1 = np.random.randn(2, 1)
    dW2 = np.random.randn(3, 3)
    db2 = np.random.randn(3, 1)
    parameters = {"W1": W1, "b1": b1, "W2": W2, "b2": b2}
    grads = {"dW1": dW1, "db1": db1, "dW2": dW2, "db2": db2}
    v = {'dW1': np.array([[0., 0., 0.],
                          [0., 0., 0.]]), 'dW2': np.array([[0., 0., 0.],
                                                           [0., 0., 0.],
                                                           [0., 0., 0.]]), 'db1': np.array([[0.],
                                                                                            [0.]]),
         'db2': np.array([[0.],
                          [0.],
                          [0.]])}
    return parameters, grads, v


def initialize_adam_test_case():
    np.random.seed(1)
    W1 = np.random.randn(2, 3)
    b1 = np.random.randn(2, 1)
    W2 = np.random.randn(3, 3)
    b2 = np.random.randn(3, 1)
    parameters = {"W1": W1, "b1": b1, "W2": W2, "b2": b2}
    return parameters


def update_parameters_with_adam_test_case():
    np.random.seed(1)
    v, s = ({'dW1': np.array([[0., 0., 0.], [0., 0., 0.]]),
             'dW2': np.array([[0., 0., 0.], [0., 0., 0.], [0., 0., 0.]]),
             'db1': np.array([[0.], [0.]]),
             'db2': np.array([[0.], [0.], [0.]])},
            {'dW1': np.array([[0., 0., 0.], [0., 0., 0.]]),
             'dW2': np.array([[0., 0., 0.], [0., 0., 0.], [0., 0., 0.]]),
             'db1': np.array([[0.], [0.]]),
             'db2': np.array([[0.], [0.], [0.]])})
    W1 = np.random.randn(2, 3)
    b1 = np.random.randn(2, 1)
    W2 = np.random.randn(3, 3)
    b2 = np.random.randn(3, 1)

    dW1 = np.random.randn(2, 3)
    db1 = np.random.randn(2, 1)
    dW2 = np.random.randn(3, 3)
    db2 = np.random.randn(3, 1)

    parameters = {"W1": W1, "b1": b1, "W2": W2, "b2": b2}
    grads = {"dW1": dW1, "db1": db1, "dW2": dW2, "db2": db2}

    return parameters, grads, v, s